Example: Raw value x: 85 · Mean: 70 · Standard deviation: 10 → Z-score: 1.5.
Percentile: 93.32%
P(above this value): 6.68%
Frequently asked questions
How do I calculate z-score? Enter your numbers above and the result updates instantly. For example: Raw value x: 85 · Mean: 70 · Standard deviation: 10 → Z-score: 1.5.
Is this Z-Score Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for z-score. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.